Somewhere in 32,403 Beetle Photos Is the One Killing Your East Texas Pine

If a pine on your property turns yellow, then red, then dead this fall, and you go looking for the insect that did it, the Texas A&M Forest Service has a correction waiting for you. The southern pine beetle — Dendroctonus frontalis, the most damaging native insect pest in Southern forests, the species that rewrote East Texas timber economics in the 1980s and 1990s — has not been reported in Texas since 1998. The agency says so plainly on its forest health page, then adds the line that matters to anyone standing in a dying stand: "Chances are that if you've found evidence of a beetle infestation on your property, it isn't southern pine beetle."

What it is, almost always, is one of the engravers or their neighbors. Three Ips species work Texas pines: Ips calligraphus at roughly 5 millimeters and partial to trunks, Ips grandicollis at 4 and usually in the upper trunk and large limbs, Ips avulsus at 3 and nearly always in the crown. Add the black turpentine beetle, which goes for fresh resin and rarely climbs past the first six or eight feet, and in the Davis Mountains the southwestern pine beetle, Dendroctonus barberi, on ponderosa. All of them punch pencil-lead holes and leave reddish-brown frass in the bark crevices. The differences live one layer down, in gallery shape: Y, H and I patterns etched by the engravers, a long winding S left by the species that supposedly left Texas.

That is an identification problem, not a mystery, and it is why a University of Florida announcement this month travels further than Gainesville. The Forest Entomology Lab has released version 2.0 of Bark and Ambrosia Beetles of the World, a curated global reference carrying 15,778 specimen records, 32,403 images and 7,990 species, filterable by species, synonym, host plant, subfamily, region, country or state. Thomas Atkinson built the underlying dataset over decades of museum work; Andrew Johnson handled the technical rebuild with a studio called Dust Productions; Sarah Smith of Michigan State and Eric Kuo of Florida maintain and expand it. A Florida Forest Service grant, drawn from the 2024 Bipartisan Infrastructure Legislation, paid for the modernization.

A vetting argument sits under the project, and it is the part a working entomologist will recognize. Bark beetle taxonomy has moved substantially in twenty years, leaving the field split between literature that is hard to follow and aggregator sites nobody checks. The Florida team went back to original species descriptions, built a synonym checklist, and shot specimens on rigs that take dozens to hundreds of focus-stacked frames apiece. For a diagnostic lab, a county agent, a nursery inspector or a pest control operator naming a specimen from a trap or a bark sample, that is the difference between an answer and a guess with a Latin ending.

In East Texas, though, the beetle that changes outcomes is an ambrosia beetle. The redbay ambrosia beetle carries Raffaelea lauricola, the fungus behind laurel wilt, which reached Texas in 2013 and has been killing red bay and sassafras since. By April 2022, AgriLife plant pathologist David Appel counted 14 East Texas counties in the outbreak, with the heaviest damage in Kingwood in northeastern Harris County, where homeowners watched mature red bays brown out from the top in weeks. The symptoms are worth knowing because they are not the pine story: streaking in the sapwood, pin holes through the bark, and small compacted sawdust sticks pushed out of the trunk that collect in bark furrows or at the base. Red bay makes up a large share of the shade canopy in East Texas and grows along the Spring Creek and San Jacinto corridors in Harris County, which means the urban forest and the rural one face the same insect.

The control advice has not moved much since Appel's warning. Confirm before cutting, because several problems mimic laurel wilt, and the Texas Plant Disease Diagnostic Laboratory at Texas A&M takes symptomatic sapwood samples. Once confirmed, remove the tree promptly and do not move the wood into country where the pathogen is not established; chips are acceptable only after they dry and start to break down. Fresh wounds on healthy trees should be painted, since damaged bark is what draws the beetle in.

The Florida authors make a point that reframes the whole service call, and it applies to pine as much as to red bay. Most bark and ambrosia beetles only attack trees already failing. The destructive few are opportunists working on forests that are overstocked, stressed by drought, or stocked with species from somewhere else. The beetle is usually evidence, not cause. East Texas gets roughly five generations of bark beetles a year when temperatures sit in the nineties; development nearly stops once the mercury drops to the fifties, which is where the region is heading. Cold slows the insect. It does nothing for a stand that was already thin on water.

The database is free and searchable, and the lab takes good beetle images, determined or not, at ajj@ufl.edu. For the pine in the backyard, the Forest Service's rule of thumb is blunter than any key: if the needles are red, the tree is already dead, and whatever is under the bark has been eating a corpse.